At this point and with Kaz's statement regarding the sounds, unfortunately there really is nothing that would persuade me to buy the game. Sure, there are things that might surprise me from TGS and I'll probably give them a thumbs up or two, but sounds have been one of my biggest gripes with the GT5 - which I only accepted beacuse of the long wait that we had to endure. The little or no improvments with GT6 are, in my opinion, simply inexcusable.
I just don't care for the awaited ''breakthrough'', at all. I'd much rather see PD improving/re-doing their sound samples for the vanilla game and then moving on to work on their new sound system - possibly for the next game.